Everybody in New England, chill ... 'cause Tom Brady is NOT in decline and the Patriots are STILL the favorites to win the Super Bowl -- so says Asante Samuel.
Of course, the ex-Pats corner is biased ... dude played with TB12 and Bill Belichick for five seasons -- but he says Tom's been just too good for too long to write him off now.
"It's never the end of a dynasty as long as they've got TB," Samuel tells TMZ Sports ... "TB is the man!"
There ain't a lot of NFL experts that would agree right now ... New England's lost two in a row and is in danger of not having a playoff bye for the first time since 2009.
But, Samuel says it's gonna be all right ... 'cause No. 12 is still under center.
"Tom has never let me down as a fan of him. And, I would imagine he's never let any other fans down. So, you just keep believing in him."
In fact ... Samuel is so confident in the G.O.A.T. -- he tells us he's still putting his money on New England to win the Super Bowl in February!!!
"As long as they got TB, that's where my money's at."